CN103023879A - Method for synchronizing wide area data between data centers based on cache - Google Patents
Method for synchronizing wide area data between data centers based on cache Download PDFInfo
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Abstract
The invention discloses a method for synchronizing wide area data between data centers based on a cache. The method is characterized by comprising the following steps of: (1) initializing synchronous systems, namely filling data frequently accessed by the systems into a memory according to the configuration by a server of a local data center, communicating with each remote data center required to be synchronized, comparing the difference of the data, and then performing synchronization; (2) performing read-write access on the data, namely directly reading and writing the cache in the memory through an interface, and writing the data in the memory into a hard disk by one or more independent threads in a service program of a background; and (3) performing remote synchronization on the data, namely periodically and directly synchronizing the contents called and modified by the interface from the memory to a remote data center, and executing the same interface calling by the remote data center to complete data synchronization. The method has the advantages of high synchronizing efficiency, small occupied bandwidth, high reliability, good transplantability and simple deployment, and solves the problem of inconsistency of other abnormities when the systems run.
Description
Technical field
The present invention relates to a kind ofly based on wide-area data method for synchronous between the data center of high-speed cache, belong to communication technical field.
Background technology
Existing real time data management system generally is take a data center as unit, carries out the distributed management of data.Even the synchronizing function of remote data center is arranged, also there is lock in time long, the shortcoming such as bandwidth occupancy is large, and also often system is very complicated, and the input cost that brings to the user is large.
Summary of the invention
Be to solve the deficiency on the prior art, the present invention seeks to be to provide that a kind of synchronous efficiency is high, occupied bandwidth is little, reliability is high, portable good, dispose wide-area data method for synchronous between simple data center.
For achieving the above object, technical scheme of the present invention is:
A kind of based on wide-area data method for synchronous between the data center of high-speed cache.The present invention is take remote data center synchronously as main purpose, improving the local data access efficiency is secondary objective, take incremental update, increment synchronously and file backup as method, provide a kind of local and remote access efficiency high, the data volume of synchronous transmission is little, wide-area data method for synchronous between the data center that also can guarantee system conformance under the condition of remote server off-line a period of time.
The present invention adopts following technical scheme to realize:
Of the present invention a kind of based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that may further comprise the steps:
(1) initialization of synchro system: after service routine starts, according to configuration with system access data in advance graftabl frequently.And communicate with the synchronous data center of needs, the difference of original and copy relatively, or have or not copy, then carry out synchronous.At first original copy and counterpart are carried out burst according to same strategy relatively, relatively then the difference of each burst carries out synchronously differentiated burst;
(2) read and write access of data: the buffer memory during the interface that the access of data is all provided by system is directly internally deposited is read and write, and the service routine on backstage has one or more separate threads that the buffer memory in the internal memory is write hard disk.The service thread on backstage is taked periodically will write in batches hard disk by the content that interface is revised, and guarantees the persistence of data, is not that each modification writes at once, neither periodically all data be write hard disk.
(3) remote synchronization of data: periodically will directly be synchronized to remote data center from internal memory by the content that interface is revised, be not that each modification is synchronous at once, periodically synchronously all data.If the servers off-line of long-range reception, home server can be revised a large amount of internal memories during this and be kept in the local file.When treating network recovery file is sent to remote data center and upgrade, guarantee the reliability of system.
(4) two-shipper of data server is standby mutually: after standby host was built and initialization finishes, high-speed cache was also consistent with main frame.Begin the synchronous renewal of receive data this moment, receive the content synchronization of modification to internal memory and hard disk by network from main frame.When the main frame machine back-up machine of delaying is taken over immediately and born service role and namely be upgraded to main frame, and the server of continuation and remote data center carries out synchronously.But artificial selection continues to serve as host role execution remote synchronization task or returns to the standby host state after the reparation of pending fault server.
Above-mentioned functions realizes by computer program, can operate on various UNIX and Linux, the Windows operating system, and not rely on the software that operating system carries.
The automatic switchover of 5 methods and main and standby competition mechanism, whether automatic decision carries out the switching of application state.Stream the present invention can reach following technique effect by above step:
1, synchronous efficiency is high, only partly carries out synchronously for the modification of data;
2, occupied bandwidth is little, adopts the burst manner of comparison of data, transmits all data when having avoided initialization, normal synchronized or abnormal restoring;
3, reliability is high, if can there be this locality in the distance host off-line with revising, treats that network recovery continues synchronously.And adopt the mutually standby technology of two-shipper;
4, portable good, all functions are to have computer program to realize fully, may operate on various UNIX and Linux, the Windows operating system software that need to not carry by any operating system;
5, have cross-platform ability, source and destination can be deployed on the server of different operating system;
6, need the data of prestrain, the upper limit of high-speed cache, the Parameter Programmings such as the size of burst are adjustable;
7, dispose simply, only need a service routine of deployment, a dynamic base, a configuration file to move.
Description of drawings
Fig. 1 is the synchronous flow chart of wide-area data between data center among the present invention;
Fig. 2 is reading and writing data browsing process figure among the present invention;
System initialization flow chart among Fig. 3 the present invention.
Embodiment
Be further described based on wide-area data method for synchronous between the data center of high-speed cache of the present invention below in conjunction with accompanying drawing.
Referring to Fig. 1 and Fig. 2, the present invention is a kind of based on wide-area data method for synchronous between the data center of high-speed cache, it is take remote data center synchronously as main purpose, improving the local data access efficiency is secondary objective, take incremental update, increment synchronously and file backup as method, and provide a kind of local and remote access efficiency high, the data volume of synchronous transmission is little, wide-area data method for synchronous between the data center that also can guarantee system conformance under the condition of remote server off-line a period of time, it may further comprise the steps:
(1) synchronous object all is the real time data in the internal memory, and the file on the disk is carried out need reading in first internal memory synchronously;
(2) to the synchronous employing increment of internal storage data synchronously with the mode of complete synchronously combination, data synchronous system provides data access interface to use to upper level applications, upper level applications is by the real time data in this interface modification internal memory, the content synchronization that synchro system is revised interface interchange arrives remote data center, and it is synchronous that the same interface interchange of remote data center execution is namely finished data;
(3) behind the reception server off-line of remote data center, the server at local data center can be revised the internal memory during this to be kept at and form backup in the local file.When treating network recovery this file is sent to teledata and upgrade, guarantee the reliability of system;
(4) mode of the data incremental update in the internal memory writes hard disk, guarantees the persistence of data.Only will write hard disk by the content that interface is revised, rather than periodically data all be write hard disk;
(5) remote data center adopts incremental update to the mode of hard disk, the Update Table calling interface that receives is write hard disk, rather than periodically all data are write hard disk;
(6) during the initialization data synchro system, local and remote data center calculates the MD5 hashed value with data fragmentation, and whether the data of the comparison of computational results two places by burst are consistent.If inconsistent then immediately that being synchronized to of burst is long-range, other unusual inconsistence problems that produce when subsystem moves in the solution.
For more further setting forth the present invention, existing specific embodiment is as follows:
Fig. 1 is the synchronous flow chart of wide-area data between data center among the present invention.Data set D for certain functional module
i, when do not arrive synchronizing cycle, received a series of retouching operation M
i(j), operation all is stored in and treats among the isochronous queue Ls (i).The network state of service routine inspection this moment and remote data center is if interruption then directly is saved in file F with the content of formation Ls (i)
i(k) in.If state is normal and arrival synchronizing cycle then sends to remote data center with the formation content.Remote data center all receives and then sends it back synchronous successful affirmation message.Then equally the content of formation Ls (i) is not saved in file F if receive affirmation
i(k) in.A plurality of synchronizing cycles, networks were all undesired after in the past then can produce a plurality of backup file F
i
If synchronous successful remote data center by calling interface with retouching operation M
i(j) same purpose in data set D ' (i).
Fig. 2 is reading and writing data browsing process figure among the present invention.
Data set D for certain functional module
i, receive retouching operation M
i(j), upgrade at once high-speed cache.And when write back cycle did not arrive, these operations all are stored in to be treated among the write-back formation Lw (i).When write back cycle arrives, the revised context among the formation Lw (i) is all write hard disk.
If read-only operation then can not operate the write-back formation, directly read the data in the high-speed cache.
System initialization flow chart among Fig. 3 the present invention.
The data set D of certain functional module during system initialization
iBe written into high-speed cache, and be divided into the n sheet and carry out the MD5 value and calculate.Then the MD5 value with n burst is transferred to remote data center.Wherein p, q, m piece two places are inconsistent to suppose to receive rear discovery by remote data center, then will number p, q, m beams back the source data center.Local source data center arrives remote data center with the transfer of data of p, q, m piece subsequently.Remote data center calling interface write cache.System initialization was finished after each data block was finished contrast.
The present invention only partly carries out having improved synchronous efficiency synchronously for the modification of data; And occupied bandwidth is little, adopts the burst manner of comparison of data, transmits all data when having avoided initialization, normal synchronized or abnormal restoring; If can there be this locality in the distance host off-line with revising, treat that network recovery continues to have increased reliability synchronously.And adopt the mutually standby technology of two-shipper; It has portable good and cross-platform ability, and all functions are to have computer program to realize fully, may operate on various UNIX and Linux, the Windows operating system software that need to not carry by any operating system; Source and destination can be deployed on the server of different operating system.
In addition, but the data of the present invention's prestrain, the upper limit of high-speed cache, the Parameter Programmings such as the size of burst are adjustable; And dispose simply, only need a service routine of deployment, a dynamic base, a configuration file to move.
In sum, the present invention is that a kind of synchronous efficiency is high, occupied bandwidth is little, reliability is high, the portability is good, it is simple to dispose.
The present invention is illustrated according to the preferred embodiment, should be appreciated that but above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the form of equivalent transformation obtains, all drops within protection scope of the present invention.
Claims (9)
1. one kind based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that, it may further comprise the steps:
(1) initialization of synchro system; The server at local data center, and is communicated by letter with synchronous each remote data center of needs system access data graftabl frequently according to configuration, and then the difference of comparing data carry out synchronously;
(2) read and write access of data; Buffer memory during the access of data all directly internally deposited by interface is read and write, and the service routine on backstage has one or more separate threads that the data in the internal memory are write hard disk;
(3) remote synchronization of data; The content of periodically interface interchange being revised directly is synchronized to remote data center from internal memory, it is synchronous that the same interface interchange of remote data center execution is namely finished data.
2. according to claim 1 based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: in described step (1), the difference of described comparing data is that the data of original and copy compare, and compares by the MD5 hashed value; If the MD5 value of data and long-rangely inconsistently then be synchronized to copy from the data original immediately.
3. according to claim 1 based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: in described step (2), what described data write the disk employing is the mode of incremental update, data synchronous system provides data access interface to use to upper level applications, and upper level applications is by the real time data in this interface modification internal memory; The service routine on backstage has one or more separate threads periodically will write in batches hard disk by the content that interface is revised, and is used for guaranteeing the persistence of data.
4. according to claim 1 based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: in described step (3), described remote data center adopts incremental update to the mode of hard disk the revised context calling interface that receives to be write hard disk in batches.
5. according to claim 2 based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: the data of described original and copy relatively are the bursts that the original of data and copy is carried out certain particle size, different bursts is produced respectively the MD5 value compare; Inconsistent burst after is relatively carried out synchronous to copy of original.
6. according to claim 3 or 4 described based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: the high-speed cache at local data center produces backup simultaneously in a standby host, when the main frame machine back-up machine of delaying is taken over immediately and born service role, and continuation and remote data center carry out synchronously.
7. according to claim 4 based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: behind the reception server off-line of described remote data center, the server at local data center can be revised a large amount of internal memories during this to be kept at and form backup in the local file; When treating network recovery this file being sent to teledata upgrades.
8. according to claim 4 or 5 described based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: the high-speed cache of described remote data center produces the backup of data simultaneously in a standby host; When the main frame machine back-up machine of delaying is taken over immediately and is born service role, and continue to receive the original place source server synchronously.
9. according to claim 1 and 2 based on wide-area data method for synchronous between the data center of high-speed cache, it is characterized in that: in the described step (1), to the synchronous employing increment of internal storage data synchronously with the mode of complete synchronously combination, data synchronous system provides data access interface to use to upper level applications, upper level applications is by the real time data in this interface modification internal memory, the content synchronization that synchro system is revised interface interchange arrives remote data center, and it is synchronous that the same interface interchange of remote data center execution is namely finished data.
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| CN103346904A (en) * | 2013-06-21 | 2013-10-09 | 西安交通大学 | Fault-tolerant OpenFlow multi-controller system and control method thereof |
| CN103543958A (en) * | 2013-09-30 | 2014-01-29 | 华为技术有限公司 | Method and device for copying incremental data |
| CN104572921A (en) * | 2014-12-27 | 2015-04-29 | 北京奇虎科技有限公司 | Cross-datacenter data synchronization method and device |
| CN104615594A (en) * | 2013-11-01 | 2015-05-13 | 阿里巴巴集团控股有限公司 | Data updating method and device |
| CN105100264A (en) * | 2015-08-21 | 2015-11-25 | 福建天晴数码有限公司 | Method and system for optimizing bandwidth |
| CN105391798A (en) * | 2015-12-04 | 2016-03-09 | 北京全路通信信号研究设计院集团有限公司 | Data synchronization method and device for train main and standby control systems |
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| CN107483631A (en) * | 2017-09-19 | 2017-12-15 | 山东大学 | A kind of system and method that mobile internet service access is realized using configuration file control caching |
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| CN112416656A (en) * | 2020-12-08 | 2021-02-26 | 卡斯柯信号有限公司 | Data offline storage method for station application server |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Gao Yuan Inventor after: Hu Xunhui Inventor after: Xu Hongqiang Inventor after: Song Xuri Inventor after: Chen Peng Inventor after: Wang Dieyu Inventor after: Zhou Ji Inventor after: Ge Chaoqiang Inventor after: Zhang Xiaobai Inventor after: Chang Naichao Inventor after: Wang Lei Inventor after: Gu Wenjie Inventor after: Ren Sheng Inventor after: Sha Yichuan Inventor after: Zhou Jieying Inventor after: Chen Guoping Inventor after: Wang Xingzhi Inventor after: Liu Jinbo Inventor after: Zhao Li Inventor before: Gao Yuan Inventor before: Gu Wenjie Inventor before: Ren Sheng Inventor before: Sha Yichuan |